四种块体非晶合金在过冷液相区内的微成形能力

Microformability of Bulk Amorphous Alloys in the Supercooled Liquid Region

采用Si模制作的V型槽微压印实验评价了4种具有不同脆度的块体非晶合金(Pd40Cu30Ni10P20,Zr65Cu15Al10Ni10,Cu46Zr42Al7Y5,Zr58.5Cu15.6Al10.3Ni12.8Nb2.8)在过冷液相区内的微成形能力。结果表明,尽管不同的BMG表现出不同的表观粘度,但在相同的应变条件下,各种BMG却呈现出相似的充型面积,这表明它们具有相似的微成形能力。这一结果源于在本实验条件下(成形温度T=1.07Tg,应变率ε&=2×10-3s-1),各BMG均遵循相同的牛顿流变机制。最后,通过有限元模拟验证了这一结论。

The microformability in the supercooled liquid region of 4 bulk metallic glasses （Pd40Cu30Ni10P20,Zr65Cu15Al10Ni10,Cu46Zr42Al7Y5,Zr58.5Cu15.6Al103Ni12.8Nb2.8） with different fragility values was investigated with microimprinting experiment on a micro-V shaped silicon mould. Results show that the bulk metallic glasses （BMGs） show different apparent viscosity. But under the condition of the same deformation, the 4 BMGs exhibit almost the same area of flowed into the groove, namely they show similar microformability. This is attributed to the adopted experimental conditions （T= 1.07Tg, k = 2×10^-3s^-1） under which the BMGs show a Newtonian flow behavior. The FEM study also verifies this conclusion.